f2pool not supporting roundtable was Re: 「魚池」BTC:270 Phash/s - LTC:500 Ghash/s - New Server in U.S. stratum-us.f2pool.com
While a PoW hash reset could be used in the event of a mining attack, don't kid yourself - no one is seriously pushing for a beyond-controversial PoW change at this time.
No one except Guy Corem and his co-signers at https://medium.com/@vcorem/lesson-learned-from-the-classic-coup-attempt-or-why-core-needs-to-prepare-a-gpu-only-pow-6a9afe18e4b0
Resetting to SHA3 just weakens bitcoin hashing power temporarily and then maybe permanently as miners have to discount their profits by taking into the possibility that the mining community will make their investments worth zero at any time.
Talk is cheap. Answering a semi-controversial 1M->2M HF with an uber-controversial SHA2->SHA3 HF in which the miners are automatically opposed to the change - near insanity. Best of luck with that one!
I think that the joker burning the money is probably about as appropriate as you get!